2 Copyright (C) 1996-1997 Id Software, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include "cl_collision.h"
24 #define MAX_EXPLOSIONS 64
25 #define EXPLOSIONGRID 8
26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
29 static int numexplosions = 0;
31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
32 static int explosiontris[EXPLOSIONTRIS][3];
33 static int explosionnoiseindex[EXPLOSIONVERTS];
34 static vec3_t explosionpoint[EXPLOSIONVERTS];
36 typedef struct explosion_s
44 vec3_t vert[EXPLOSIONVERTS];
45 vec3_t vertvel[EXPLOSIONVERTS];
50 static explosion_t explosion[MAX_EXPLOSIONS];
52 static rtexture_t *explosiontexture;
53 static rtexture_t *explosiontexturefog;
55 static rtexturepool_t *explosiontexturepool;
57 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
58 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
60 static void r_explosion_start(void)
63 unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
64 explosiontexturepool = R_AllocTexturePool();
65 fractalnoise(&noise1[0][0], 128, 32);
66 fractalnoise(&noise2[0][0], 128, 4);
67 fractalnoise(&noise3[0][0], 128, 4);
68 for (y = 0;y < 128;y++)
70 for (x = 0;x < 128;x++)
73 j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
77 a = noise3[y][x] * 3 - 128;
78 data[y][x][2] = bound(0, r, 255);
79 data[y][x][1] = bound(0, g, 255);
80 data[y][x][0] = bound(0, b, 255);
81 data[y][x][3] = bound(0, a, 255);
84 explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
85 for (y = 0;y < 128;y++)
86 for (x = 0;x < 128;x++)
87 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
88 explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
89 // note that explosions survive the restart
92 static void r_explosion_shutdown(void)
94 R_FreeTexturePool(&explosiontexturepool);
97 static void r_explosion_newmap(void)
100 memset(explosion, 0, sizeof(explosion));
103 static int R_ExplosionVert(int column, int row)
107 // top and bottom rows are all one position...
108 if (row == 0 || row == EXPLOSIONGRID)
110 i = row * (EXPLOSIONGRID + 1) + column;
111 yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
112 pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
113 explosionpoint[i][0] = cos(yaw) * cos(pitch);
114 explosionpoint[i][1] = sin(yaw) * cos(pitch);
115 explosionpoint[i][2] = 1 * -sin(pitch);
116 explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
117 explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
118 explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
122 void R_Explosion_Init(void)
126 for (y = 0;y < EXPLOSIONGRID;y++)
128 for (x = 0;x < EXPLOSIONGRID;x++)
130 explosiontris[i][0] = R_ExplosionVert(x , y );
131 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
132 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
134 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
135 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
136 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
141 Cvar_RegisterVariable(&r_explosionclip);
142 Cvar_RegisterVariable(&r_drawexplosions);
144 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
147 void R_NewExplosion(const vec3_t org)
153 unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
154 fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
155 for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
159 numexplosions = max(numexplosions, i + 1);
160 e->starttime = cl.time;
161 e->endtime = cl.time + cl_explosions_lifetime.value;
162 e->time = e->starttime;
163 e->alpha = cl_explosions_alpha_start.value;
164 e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
165 e->clipping = r_explosionclip.integer != 0;
166 VectorCopy(org, e->origin);
167 for (j = 0;j < EXPLOSIONVERTS;j++)
169 // calculate start origin and velocity
170 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
171 dist = n * cl_explosions_size_start.value;
172 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
173 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
174 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
178 trace = CL_Move(e->origin, vec3_origin, vec3_origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
179 VectorCopy(trace.endpos, e->vert[i]);
187 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
189 int surfacelistindex = 0;
190 const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
192 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
195 GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
197 GL_CullFace(r_refdef.view.cullface_back);
198 R_Mesh_Matrix(&identitymatrix);
200 R_SetupGenericShader(true);
201 R_Mesh_ColorPointer(NULL, 0, 0);
202 memset(&m, 0, sizeof(m));
203 m.tex[0] = R_GetTexture(explosiontexture);
204 m.pointer_texcoord[0] = explosiontexcoord2f[0];
205 R_Mesh_TextureState(&m);
206 for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
208 const explosion_t *e = explosion + surfacelist[surfacelistindex];
209 R_Mesh_VertexPointer(e->vert[0], 0, 0);
210 // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
211 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
212 GL_LockArrays(0, numverts);
213 R_Mesh_Draw(0, numverts, numtriangles, explosiontris[0], 0, 0);
218 static void R_MoveExplosion(explosion_t *e)
221 float dot, end[3], frametime;
224 frametime = cl.time - e->time;
226 e->alpha = e->alpha - (e->fade * frametime);
227 if (e->alpha < 0 || cl.time > e->endtime)
232 for (i = 0;i < EXPLOSIONVERTS;i++)
234 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
236 VectorMA(e->vert[i], frametime, e->vertvel[i], end);
239 trace = CL_Move(e->vert[i], vec3_origin, vec3_origin, end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
240 if (trace.fraction < 1)
242 // clip velocity against the wall
243 dot = -DotProduct(e->vertvel[i], trace.plane.normal);
244 VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
246 VectorCopy(trace.endpos, e->vert[i]);
249 VectorCopy(end, e->vert[i]);
254 void R_DrawExplosions(void)
258 if (!r_drawexplosions.integer)
261 for (i = 0;i < numexplosions;i++)
263 if (explosion[i].alpha)
265 R_MoveExplosion(&explosion[i]);
266 if (explosion[i].alpha)
267 R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
270 while (numexplosions > 0 && explosion[i-1].alpha <= 0)